c++03 Initializing a array of objects with multiple parameters

Question

This might be a simple question but I am trying to initialize an array of objects using a parameterized constructor. For example:

class A{
public:
    int b,c,d;
    A (int i, int j);
};

void A::A(int i, int j){
    d = rand()
    b = 2*i;
    c = 3*j;
}

void main(){
    A a[50]; /*Initialize the 50 objects using the constructor*/
}

I have already tried with vector initialization as mentioned in this link however, since there are 2 parameters, this does not work.

Also, as mentioned in this link, it is not possible and tedious to manually enter 50 initialization values.

Is there a easier way. Also, i,j values are the same for all objects (available through main()) but d should be random value and differs from each object.

score 2 · Accepted Answer · 2016-09-22 14:43:18Z

2

You can use std::generate

Example:

A generator(){ return A(1,2); }

std::generate( a, a + (sizeof(a) / sizeof(a[0])), generator );

edited Sep 22, 2016 at 14:43

answered Sep 22, 2016 at 14:41

user5405790

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2 Comments

user6300394 Over a year ago

Good luck with that in C++03! (No lambdas until C++11).

user5405790 Over a year ago

Yes, I forgot this. Updated

user6300394 · Accepted Answer · 2016-09-22 14:40:29Z

0

Why not supply default arguments to your two-argument constructor?

A (int i = 0, int j = 0);

Then it will stand in for the default constructor, and A a[50]; will use it automatically 50 times.

answered Sep 22, 2016 at 14:40

user6300394

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